Two former Parramatta Eels players are accused of harbouring semi-automatic weapons and possessing more than half-a-million dollars in cash after dramatic arrests in Sydney's Centennial Park yesterday.

Barnett warns against voting One Nation

Premier Colin Barnett has cautioned people against voting for One Nation, saying it would be bad if the balance of power in WA's upper house was controlled by candidates from a minor party.

A Newspoll released last week suggested Pauline Hanson's One Nation would be the third most popular party with 13 per cent of the primary vote and some political analysts think it could get a far higher vote and have the balance of power.

"Yeah, I think that would be a problem," Mr Barnett told Sky News.

"When we've seen minor parties, sometimes with an odd assortment of candidates, it makes government very, very difficult.

"Whether it be a Liberal or Labor government, to able to actually govern and do the things that are necessary.

"One of the things that I will be saying repeatedly through this campaign will be: who do you really trust to run your school systems, your hospitals, law and order, planning, development and the environment?"

The Barnett government's eight-year reign could end at the March 11 vote, with Labor leading in most polls over the last 18 months, but the premier said while it would be tough he believed he could still win.